0
First, DO NOT adjust the idle screw on the throttle body. This is set by GM, and adjusting it can have dire effects on your Fiero due to the ECM reading incorrect signals (Typically, the ECM will adjust for idle correct and either spray more or less fuel).
A few easy things you can check is the IAC (Idle Air Control) valve. That is the very large valve that protrudes out of the side of the throttle body. It requires a large 1"1/4" socket - and you need to use a socket, not any sort of wrench, to remove it. Remove it and it'll likely be stuck all the way in (you should see the spring compressed). Spray it with brake clean or another heavy duty cleaner and let it sit overnight. The brake clean should loosen the spring up and make the valve work temporarily. If after placing the valve back onto the car and driving it that the problem isn't remedied it and the spring returns to it's original position, then you will need to replace the valve itself.
Another problem could potentially be the MAP (Manifold Absolute Pressure) sensor. This is that rectangular box that is attached to the red intake plenum on the passenger side of the car. This is an extremely common GM sensor and they can be had very cheap and both the 2.8L V6 and 2.5L L4 Fieros use it.
Finally, you might have a vacuum leak that you will need to trace and find.
Other than that there's not much more that could cause high idle.
Source: Have owned Fieros for over ten years.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What does the ditloid 28L in the WA mean?
28 Letters in the Word "Antidisestablishmentarianism"
What is the correct timing for a 1986 Chevy Camaro 28L?
The order is 1,2,3,4,5,6
Where is the oxygen sensor located on a '89 Beretta w 28L V6?
it should be located on the rear manifold
The hypotenuse of a right triangle is 26 feet long One leg is 14 feet longer than the other Find the length of the shorter leg?
Let the length of the shorter leg be L, then the longer leg is L + 14.By Pythagoras then 262 = L2 + (L + 14)2 = L2 + L2 + 28L + 196 = 2L2 + 28L + 196676 = 2L2 + 28L + 196 : 2L2 + 28L - 480 = 0 : L2 + 14L - 240 = 0This can be factored : L2 + 14L - 240 = (L + 24)(L - 10) = 0As only a positive number answer applies and this is when L - 10 = 0 : L = 10.The length of the shorter leg is 10 feet.
Where is the starter on a 1987 Chevrolet Blazer S10 with a 28L V-6 motor at?
under exaust manifold on passenger side
How many psi is the fuel pump on a 1988 buick century custom v6 28l fi?
Should be around 40 psi
What is the fuel on 1983 S-10 28L?
gasoline-usually 89 octane. fuel filter is in the rochester 2se carburetor on a 2.8l 1983 Chevy motor.
What are some causes and remedies for an 86 Jeep Cherokee with a 28L V6 with a very high CO output?
First, check your air filter and O2 sensor. Both probably need to be replaced. If the HC is up, change the plugs and wires too. If the vehicle is carburated you probably don't have an O2 sensor.
Where is the map sensor located on a 85 camaro 28l?
should be a small black plastic box close to the distributor mounted on a bracket. it will have a couple of wires and a vacuum line the runs to the intake manifold
28l beretta what sensor is located under throttle body but on engine by to small coolant lines spewing oil from it you pretty sure not oil pressure sensor?
could be tps or throttle positioning sensor
What does it mean when you have low levels of Immunoglobulin G Qn Serum?
what does it mean when my IGM is low at 28L
88 cavalier wagon 28L v6 marked spark plug wires but rubbed off book doesnt tell you which wire runs to what spark plug anyone know?
Here you go. Copy & paste into your browser. http://autorepair.about.com/library/firing_orders/bl-fo-10962.htm
